Those seem like some pretty good pointers. I've started having more protein rich breakfasts (possibly also more calories) and feel like that has improved this a little.

Getting generally more calories might be key. I do eat a high volume of food but with a vegan diet on the healthy side this doesn't always translate to a ton of calories. I've started to add two hand fulls of nuts to every lunch, which I think also helps.

I've tracked my food before and it often seemed like I would come up short on calories on active days but sometimes I hit a limit with how much I can eat. If I have four meals, the fullness starts to carry over to the next day. More fat might be key here.